Impulse-transmitter.



H. HOVLAND.

IMPULSE TRANSMITTER.

APPLICATION FILED FEB. 8, 1917.

1 ,27 1, 1 645. Patented July 2, 1918.

//7 Van for; Henry Ha /and.

UNITED STATES PATENT oEEIoE.

HENRY HOVLAND, OF EAST ORANGE, NEW JERSEY. ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 013 NEW YORK.

IMPULSE-TRANSMITTER.

Specification of Letters Patent.

Llatentod July 2, 1918.

To all whom it may concern:

Be it known that I, HENRY HOVLAND, a citizen of the United States, residing at East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Impulse- Transmitters, of which the following is a full, clear, concise, and exact description.

This invention relates to impulse sending devices, and more particularlyto substation impulse sending devices for telephone exchange systems.

The object of this invention is to provide an impulse sending device which is simple in structure and operation, and by means of which impulses may be sent rapidly and accurately.

In accordance with the general object of this invention, the impulse sender is designed to interrupt the circuit to send the impulses while the dial is being moved by the finger.

Other features of the invention relate to the means provided for regulating the length of the time of separation of 1mpulse contacts regardless of the speed at which the dial is moved and means for continuously maintaining one set of contacts closed during the movement of the dial. Preferably the impulse springs are operated by means. of a pivotal hammer which is controlled by projections on the dial. The projections on the dial which control the hammer also control the mechanism by means of which the springs which are to be maintained closed during the operation of the dial are controlled.

In the drawings illustrating this invention, Figure 1 is a View in front elevation of a sender made in accordance with this invention; Fig. 2 is a view in side elevation of the device; and Fig. 3 is a rear view of the device.

As shown in the drawings, 5 designates a dial plate rotatably mounted upon a base plate or support 6 and provided with a plurality of finger holds 7, 7

Secured to the rear face of the base plate or support 6 are two contact sets 10 and 11 supported upon integrally formed pro ections 12 and 13 on said base plate 6. Included in the contact set 10 is a normally closed contact l-l; which controls the impulses and is adapted to be intermittently opened by the operation of a spring operated hanuuer head 15 controlled by projections 16, 16, carried upon the inner face of the dial plate 5. As shown, the hammer head 15 is carried by a spring 17, one end of which is secured to the projection 12 and which has a projection 18 extending through an opening 19 in the base 6 into position to be lifted by the projections 16, 16 on the dial plate. As the hammer head 15 operates it hits a spring 20 which controls the contact 14 to open it at each blow of the hammer. Each of the projections 16, 16 is provided with an abrupt face 21 which insures the quick action of the hammer head 15, when one of said projections 16 passes from engagement with the projection 18.

Included in the contact set 11 are two spring members 25 and 26 normally in engagement with each other to close a contact 27. When, however, the spring 25 is moved inwardly toward the center of the device by means to be hereinafter described, the contact 27 is opened and spring 26 closes contact 28 with a stop member 29. Pivotally supported on a lug 30 is a lever 31 provided at one end with a spring operating roller 32, and at its other end with a tail piece 33 which extends through an opening 34 in the plate 6 into position to be engaged by the projections 16, 16 on the dial plate 5. The engagement between the projections 16, 16 and the tail piece 33 of the lever 31 causes the spring operating roller 32 to swing toward the center of the device to move the spring 25 out of engagement with the spring 26 and permit the latter to close its-contact 28 with stop 29. The tail piece 33 is of suflicientlength so that by the time one of the projections 16 moves from engagement therewith in the rotation of the dial, another projection 16 will be in position to engage it to maintain the contact 27 open and contact 28 closed. At the end of the forward movement of the dial 5, that is, when the finger of the operator has reached a stop 36 and been withdrawn from the finger hold of the dial, a slight back lash in the dial will per.-

- mit suficient play to allovr 'the springs 25 v and 26 to return to normal position with contact 27 closed and contact 28 opened.

What is claimed'is:

1. In an impulse transmitter, a finger hold dial arranged for movement in a single direction, and impulse contacts operated by said finger hold dial during the movement thereof. I

2. In an impulse transmitter, a finger hold dial, impulse springs, and means controlled in the movement of said finger hold dial for regulating the length of time of separation of said impulse springs regardless of the speed of movement of said dial.

3."In an lmpulse transmitter, a finger hold dial,'impulse springs, a pivotal hammer adapted to strike and separate said springs, and means carried by said finger hold dial for intermittently operating said hammer in the movement of said dial by the operator. I

4. In an impulse transmitter, a finger hold dial, impulse springs intermittently opened by the finger hold dial during the movement thereof by the operator, a set of normally open spring contacts, and means controlled by said finger hold dial in its movement, to maintain the normally open spring contacts closed.-

5. In an impulse transmitter, a finger hold dial, impulse springs, projections on said finger hold dialadapted to intermittently operate said impulse springs in the .movement of saidfinger hold dial, a set of normally open spring contacts, and means controlled by said projections on said finger hold dial for maintaining said normally open spring contacts closed during the movement of said dial.

6. In an impulse transmitter, a finger hold :dial arranged for movement in asingle direction, a set of impulse contacts, and means operated by said finger hold dial for intermittently opening said contacts, said means being arranged to regulate the length of time of opening of the contacts for variable speeds of the finger hold dial.

In Witness whereof, I hereunto subscribe my name this 5th day of February A. .D.,

HENRY HOVLAND. 

